A note on the strength and deformation properties of a some sandstone under three-point bending in the context of tension and compression behaviour

Abstract

The results of the three-point bending test of the Brenna sandstone beam samples are presented. The values of strains at the peak strength of the tensile part was εxmax, the strength of three-point bending was σb and the modulus of longitudinal elasticity (of the tensile part) was Eb - all of these values were indicated. The values of constants obtained in the three-point bending tests were compared with those obtained in the uniaxial tensile and compressive tests and the Brazilian tests. For this typical sandstone, values of constants determined by the three-point bending tests are greater than those determined by the direct tensile tests. There were stated large differences in the tensile strength values (σb/σT≍3) and relatively small differences in the elasticity modulus E (Eb/ET≍1.2).